Miguel Ángel Battini

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The interaction between native fishes and salmonids introduced in Patagonia at the beginning of the 20th Century, developed at the same time as the environmental change. The phenomenon of global warming has led to the formulation of predictions in relation to changes in the distribution of species, in the latitudinal dimension, both at intralacustrine, or(More)
Effects of subcutaneous visible implanted alphanumeric (VIA) microtags, pelvic fin excision, and individual photo-identification (Pid) based on natural spot patterns were experimentally evaluated in the small stream benthic Patagonian catfish Hatcheria macraei. VIA tag retention was 90 % during the first 45 days, decreasing to 80 % at day 200, and 66 % at(More)
Diel locomotor activity and shelter use was experimentally evaluated in Hatcheria macraei under three different light regimens: natural and inverted photoperiods, and during constant darkness. The results demonstrate clear nocturnal activity and highlight the negative phototactic behaviour of H. macraei, proving that light is the external factor that(More)
Food availability and predation risk have been shown to affect phenotypes during early life history of fishes. Galaxias maculatus, a small fish widely distributed around the southern hemisphere, clearly exhibits a complex trade-off between feeding and predation avoidance during growth over the larval period. We studied the effect of different environmental(More)
The effects of the introduced rainbow trout (Oncorhynchus mykiss) on both habitat use and diel locomotor activity of the native Creole perch (Percichthys trucha) were assessed. Experiments were performed with juveniles of both species during a 24-h period. Habitat use was measured in channels with different habitat categories, and diel locomotor activity(More)
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